Photo-assisted aromatic VOC sensing by a p-NiO:Li/n-ZnO transparent heterojunction sensor element
| Autor: | Yui Ishikura, Yoshinobu Nakamura, Satoru Fujitsu, Yusuke Morita, Hidenori Takagi |
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| Rok vydání: | 2013 |
| Předmět: |
Photocurrent
Materials science business.industry Non-blocking I/O Metals and Alloys Analytical chemistry Heterojunction Sputter deposition Condensed Matter Physics Isotropic etching Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention law Materials Chemistry Optoelectronics Electrical and Electronic Engineering Photolithography business p–n junction Instrumentation Deposition (law) |
| Zdroj: | Sensors and Actuators B: Chemical. 187:578-585 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2013.04.105 |
| Popis: | A p-NiO/n-ZnO transparent heterojunction diode is prepared by the continuous film deposition using RF magnetron sputtering technique and processed into a chemical sensor element by photolithography patterning and chemical etching. The inter-digital sensor arrays have pn junction interfaces facing the atmosphere and its I–V response is slightly modified by the introduction of VOCs (volatile organic compounds) under dark. The sensor performance for aromatic VOCs is extremely enhanced under deep UV light (λ = 254 nm) irradiation and the photo-current rapidly decreases as a function of VOC concentrations. The photo-driven electron transport between photo-excited VOC adsorbates and valence band (VB) of p-NiO is essential to the VOC sensing in this system. |
| Databáze: | OpenAIRE |
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